it is because each time when you kisses without closing your eyes you do not no the sweetness and it does not make it look serious.kissing is not love but it is a sign of saying i recognise and agree with what we doing.

You close your eyes to shut out distractions and to simulate darkness allowing your mind to reach the sleep state easier. When you fall asleep, your normal blink reflexes are no longer operational. This means if your eyes were open, you're more likely to suffer eye damage. So, our bodies keeping our eyes closed is a natural means of protecting them during a pretty vulnerable time.

Typically, when I'm kissing someone, I've no interest in going to sleep.